Dark Samus

Dark Samus (ダークサムス, Dāku Samusu) is a being of Phazon assuming the form of Samus Aran and the reincarnation of the organism known as Metroid Prime. After making a cameo appearance in the secret ending of the Metroid Prime game, she becomes the overarching antagonist and the final boss of Metroid Prime 2: Echoes and the main antagonist of Metroid Prime 3: Corruption.